SECURITY: WINDOWS DEFENDER Non-Privileged User Gain System Privileged Access EXPLOIT

Microsoft Defender Antivirus

Microsoft Defender Antivirus Logo from Wikipedia.1

A hacker by the name, "Nightmare-Eclipse", releases another exploit shortly after Microsoft patched a previous one (CVE-2026-33825) by the same hacker. The exploit name is "Red Sun". Nightmare-Eclipse threatened with more exploits as a direct outcome of grievances further expressed on a Blogspot.1

“I didn’t want to be evil, but they are actively poking me to start releasing RCEs, which I will be doing at some point… I will personally make sure that it gets funnier every single time Microsoft releases a patch...

I was told personally by them that they would ruin my life, and they did...

They took away everything. They mopped the floor with me and pulled every childish game they could. It was soo bad at some point I was wondering if I was dealing with a massive corporation or someone who is just having fun seeing me suffer, but it seems to be a collective decision...

They do everything but support the research community, I won't disclose details but they sabotage people a lot. I mean just look at the past, Microsoft is the only major company who had a track of multiple vulnerabilities being publicly disclosed just because the researchers were soo upset by how MSRC treated them.” 

These types of situations are byproducts of ongoing sentiment souring in various work environments, but that is a separate topic in of itself and outside the scope of this post. Whether the alleged claims of maltreatment happened or not, the attacker has awareness of key vulnerabilities with Windows Defender and obviously motivated, as an act of revenge, to keep exposing more vulnerabilities.

VERSIONS

2026v.0.1.0

REFERENCES

  1. Cybernews: "Angry researcher drops second Windows Defender just hours after Microsoft patches first one" 2

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